10L Large Capacity: This bicycle rear rack carrier bag features a main compartment, a top pocket and a water bottle pocket, which can help you store the essentials on the road well. Safety Design: There are several reflective strips on the rear bike rack bag for increasing visibility and safety at night. Taillights (Not Included) can be installed at the back of the bag, which greatly improves the safety of riding. Water-Resistant Material: This bike commuter bag is made of water-resistant fabric. Insulated lining keeps your drinks and food taste good for several hours. Elastic bungee cord on the top for increasing storage space. Convenient to Install: This bicycle saddle bag is equipped with adjustable mounting straps for quick installation and removal. With an adjustable shoulder strap, it is convenient to carry when you are not cycling. Wide Application: This bike backseat storage bag is suitable for most bicycle racks, such as mountain bikes, road bikes, etc. It can be a bike rear rack bag, a shopping bag and a shoulder bag.